President Trump took cash intended for childhood cancer research and funneled it into his personal businesses — charging his son Eric to hold charity events at a family-owned golf course in the process, a report says.

Financial documents obtained by Forbes outline the money-making scheme and show how the commander-in-chief spent years redirecting thousands of dollars raised by the Eric Trump Foundation, through its annual charity golf tournament, into his own businesses.

Specifically, tax filings from the nonprofit itself and other charities detail how Trump took money intended for the St. Jude Children’s Research Hospital in Memphis and used it to generate revenue and cover the costs of the fundraisers.

At least two sources told Forbes that the real estate mogul personally ordered Eric to start using the cash raised for charity to foot the bill in 2011 as costs for the golf tournament began to rise.

“In the early years, they weren’t being billed [for the club] — the bills would just disappear,” Ian Gillule, former membership and marketing director of Trump National Westchester, told the magazine.

“Mr. Trump had a cow. He flipped. He was like, ‘We’re donating all of this stuff, and there’s no paper trail? No credit?’ And he went nuts. He said, ‘I don’t care if it’s my son or not — everybody gets billed.'”

At one point, the Donald J. Trump Foundation donated $100,000 to the Eric Trump Foundation — as another way to cover the costs — but the money was funneled right back into the family businesses, the documents show.

“His father, Mr. Trump, always, until the presidency, had a very, very tight rein on what was going on,” Gillule said. “The buck always stopped with him.”

To make matters worse, Forbes reports that more than $500,000 was taken from St. Jude and re-donated to other charities connected to the Trump family or their interests — many of which had nothing to do with cancer research.

Trump originally had no problem letting Eric host the golf event at the Trump National Golf Club in Westchester for free during the first few years, but he reportedly changed his mind as the budget rose.

From its inception in 2007 to 2010, the total expenses were about $50,000, according to the tax filings.

They were hovering around $142,000 in 2011 — and shot up to $322,000 by 2015, the documents show.

“The charity had grown so much that the Trump Organization couldn’t absorb all of those costs anymore,” explained Katrina Kaupp, a former board of directors member at the Eric Trump Foundation.

“We did have to cover the expenses,” she insisted.

Eric himself claims the golf tournament hasn’t cost as much.

“Our expenses on a tournament that made us somewhere in the $2 million range every year was somewhere around 100 grand,” he told Forbes, despite the tax filings.

“We get to use our assets 100 percent free of charge,” he added.

The Eric Trump Foundation reportedly declined to provide an itemized list of expenses when asked by the magazine.